<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>

</body>
</html>
<script>
    //声明一个函数
    function test1(num1,num2) {
        return num1+num2;
    }
    function  text2(){
        console.log(arguments);
    }
    var fun = new Function('x','y',"return x+y");
    var res = test1(2,2);
    var info = text2(12,33);

    var a = fun(4,5);

    console.log(a);

</script>